I always figured it would be trouble, all the jostling of the drives on and off of the thing might reduce the life of the drives, but it's been good to me. It was great for when I upgraded my computer and was able to just set aside one of the smaller drives instead of finding space in the new case.

^ It does have automatic HDD spin-down, at which point the power consumption is negligible.

Automatic full power off wouldn't be very desirable to me because then you'd have to manually turn it on to access it or at the very least wait for your OS to redetect it as removable storage and mount the drive volume which would take several times as long a wait as it does for the drive to just spin up.

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